Performing attacks based on the mode opposite that the mob is currently in will trigger Virulent Haze.For example, casting magic when it's in physical mode, or a physical WS when it's in magic mode.

Unlike Lusca, Amphitrite will always spawn in one of the "modes" (chosen randomly), meaning immediately upon spawn it will not be vulnerable to either physical or magical damage. Be aware that if spawns absorbing physical damage, melee attacks that heal it for 0 HP (since its HP is full) will not give it any TP and will give the attackers little to no hate as well, resulting in a mob that may be difficult to control at first and may easily go after the mages/backline. Putting a DoT effect on it quickly, such as Dia, will make it easier for melees to feed it TP, but bear in mind that this will also trigger Virulent Hazes.